IIM Bangalore (UGAT) Grammar > Parts of Speech PYQs

From the options given below, identify the pair of adjectives in the following statement. In the mellifluous, iridescent dusk, she moved deliberately and resolutely, allowing her equanimity and fortitude to guide her choices, as uncertainty gathered around her in the evening light.

Select an option to complete the given sentence. _______ had the researchers completed their preliminary trials, ________ fresh complications emerged that altered the entire direction of the study.

In which sentence does since function as an adverb?